Losing any player to injury in the international break can be a huge blow.
But when it's one as important as Kyogo Furuhashi is to Celtic, it can be a seismic shift in any club's season.
That's what the Hoops are facing up to as the 26-year-old is reportedly set to spend a month out with a knee injury he picked up while representing Japan in their win over China.
It's a real headache for Parkhead boss Ange Postecoglou as his team embark on a hectic schedule on both the domestic and European scenes.
According to the Scottish Sun, diminutive attacker Kyogo is set to miss seven games with the issue.
Alongside Celtic's Premiership and Premier Sports Cup campaigns lie two massive Europa League group stage encounters they'd rather have the mercurial hitman to call upon for.
Kyogo has been an integral part of Postecoglou's Parkhead rebuild - netting seven goals to start his debut campaign in green and white as well as turning in a host of impressive, energetic performances.
Here are the seven fixtures he could potentially miss.
Celtic's next seven matches
Ross County (H) - Premiership - Saturday, September 11
Real Betis (A) - Europa League - Thursday, September 16
Livingston (A) - Premiership - Sunday, September 19
Raith Rovers (H) - Premier Sports Cup - Thursday, September 23
Dundee United (H) - Premiership - Sunday, September 26
Bayer Leverkusen (H) - Europa League - Thursday, September 30
Aberdeen (A) - Premiership - Sunday, October 3
